The case started out focused on five patents, but two patents expired this year and then Google decided to drop two other patents from the suit because they were considered industry standards. The company didn't back down on the remaining patent, however, contending that it covers technology involved in how the Xbox and accessories communicate.

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"We are disappointed with today's determination and look forward to the full commission's review," Google spokesman Matt Kallman said in a statement to CNET.

Microsoft, of course, is happy with today's decision.

"We are pleased with the administrative law judge's finding that Microsoft did not violate Motorola's patent and are confident that this determination will be affirmed by the commission," David Howard, Microsoft's corporate vice president and deputy general counsel, said in a statement today. "The ITC has already terminated its investigation on the other four patents originally asserted by Motorola against Microsoft."